onsemi Memory FM25C640UVN

The FM25C640UVN is a 64K-bit serial CMOS EEPROM that utilizes a SPI (Serial Peripheral Interface) for data communication, adhering to the SPI 4-wire protocol. It features a minimal pin count, which simplifies PCB layout, and operates within a voltage range of 2.7V to 5.5V. The device supports a maximum clock frequency of 2.1 MHz at 4.5V to 5.5V, ensuring efficient data transfer. This EEPROM includes hardware write protection via the /WP pin and software block write protection, allowing users to safeguard specific memory sections from inadvertent programming. The /HOLD pin enables temporary suspension of data transfer, enhancing control during operation. The device is designed for high endurance, with a write cycle endurance of up to 1,000,000 data changes and a data retention period exceeding 40 years. Typical standby current is low, at 1µA for standard devices and 0.1µA for low-power variants, making it suitable for power-sensitive applications. The FM25C640UVN is available in an 8-pin DIP package, making it compatible with various microcontrollers, including the 68HC11 and other SPI-compatible devices.